Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The MODU-FIRE FD N750 and N1000 share the same 54" × 32" × 52" shipping box, 800 lb operating weight, 6.2-gallon water content, 116 sq. ft. heated surface, 1-1/4" gas and 2-1/2" water connections and 5:1 turndown; the N1000 adds 250 MBH of input and 212 MBH of output, raises minimum input from 150 to 166 MBH and moves 85 GPM at a 20°F ΔT versus 63.8 GPM.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | P-K MODU-FIRE FD N750 | P-K MODU-FIRE FD N1000 |
|---|---|---|
| Minimum input | 150 MBH | 166 MBH |
| Input | 750 MBH | 1,000 MBH |
| Output | 638 MBH | 850 MBH |
| Efficiency (page) | 88 % | 88 % |
| Turndown ratio | 5:1 | 5:1 |
| Main gas connection | 1 1/4" NPT-F | 1 1/4" NPT-F |
| Boiler supply / return | 2 1/2" NPT (supply F / return M) | 2 1/2" NPT (supply F / return M) |
| Operating weight | 800 lb | 800 lb |
| Shipping weight | 820 lb | 820 lb |
| Boiler water content | 6.2 gal | 6.2 gal |
| Boiler HP | 19 | 25.4 |
| Heated wet surface area | 116 sq. ft. | 116 sq. ft. |
| Flow rate @ 20°F ΔT | 63.8 GPM | 85 GPM |
| Combustion air inlet | 8" dia. stub | 8" dia. stub |
| Exhaust vent | 6" (5" with adapter) | 6" (5" with adapter) |
| Shipping width | 32 in | 32 in |
| Shipping length | 54 in | 54 in |
| Shipping height | 52 in | 52 in |
P-K's submittal prints the N750MFD at 750,000 BTU/hr input / 638,000 BTU/hr output with a 150,000 BTU/hr minimum, and the N1000MFD at 1,000,000 / 850,000 with a 166,000 BTU/hr minimum. Both modulate at 5:1.
Everything physical is shared: the same 54" × 32" × 52" shipping dimensions, 800 lb operating and 820 lb shipping weights, 6.2 gallons of water, 116 sq. ft. of heated wet surface, 8" combustion-air stub, 6" exhaust (5" with adapter), 1-1/4" NPT gas and 2-1/2" NPT supply/return connections.
The flow rate at a 20°F ΔT is the practical difference — 63.8 GPM on the N750 against 85 GPM on the N1000 — which sets the near-boiler piping and pump sizing. Both are forced-draft non-condensing boilers requiring Category II or IV venting at up to 88% efficiency.
Patterson-Kelley
The P-K MODU-FIRE FD N750 is a forced-draft non-condensing commercial boiler rated 750 MBH input and 638 MBH output in Patterson-Kelley's published submittal, with 5:1 turndown, a 150 MBH minimum input and a 800 lb operating weight.
Patterson-Kelley
The P-K MODU-FIRE FD N1000 is a forced-draft non-condensing commercial boiler rated 1000 MBH input and 850 MBH output in Patterson-Kelley's published submittal, with 5:1 turndown, a 166 MBH minimum input and a 800 lb operating weight.
Yes — both print 800 lb operating / 820 lb shipping and a 54" × 32" × 52" shipping box on the submittal.
63.8 GPM for the N750MFD and 85 GPM for the N1000MFD at a 20°F ΔT, per the submittal.
A consultation includes a heat-loss review so the size is right the first time.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.